Analysis of velocity error of satellite TT&C system caused by atmospheric refraction

Due to the non-uniformity of the dielectric characteristics of each altitude layer of the atmosphere, the refraction effect will be produced when the radio wave propagates along the earth-air link, which will lead to different degrees of refraction errors to the satellite TT&C system. Aiming at the orbit determination mode of single frequency and single station satellite system, a high-precision velocity error correction algorithm based on Doppler frequency shift velocity measurement principle is given, and compared with the velocity measurement algorithm based on phase path error change rate principle and measured data to verify the accuracy of the algorithm. The velocity refraction errors caused by delay effect and bending effect are simulated and calculated by using the modified algorithm. Based on the satellite system parameters of different frequency bands and different orbital heights, the variation characteristics of velocity error caused by tropospheric and ionospheric refraction are compared and analyzed. The analysis results can provide accurate velocity error correction reference for the current satellite TT&C system of earth-air link, and evaluate the influence of atmospheric refraction on the velocity measurement error of spaceborne single frequency receiver reasonably and accurately.